import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Scanner sn = new Scanner(System.in);
        int numSteps = sn.nextInt();
        if (numSteps < 2) {
            System.out.println("0");
        }
        else {
            String s = sn.nextLine();
            s = sn.nextLine();
            char[] stepsArray = s.toCharArray();
            boolean isInAValley = false;
            int countValleys = 0;
            int seaHeight = 0;
            for (int i = 0; i < stepsArray.length; i++) {
                if (stepsArray[i] == 'U') {
                    seaHeight++;
                    if (seaHeight == 0 && isInAValley) {
                        countValleys++;
                        isInAValley = false;
                    }
                }
                else if (stepsArray[i] == 'D') {
                    seaHeight--;
                    if (seaHeight == -1) {
                        isInAValley = true;
                    }
                }
            }
            System.out.printf("%d",countValleys);
        }
    }
}